1131111212 has 48 divisors (see below), whose sum is σ = 2520419328. Its totient is φ = 431310720.

The previous prime is 1131111209. The next prime is 1131111217. The reversal of 1131111212 is 2121111311.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (1131111217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24593 + ... + 53544.

It is an arithmetic number, because the mean of its divisors is an integer number (52508736).

Almost surely, 2^1131111212 is an apocalyptic number.

It is an amenable number.

1131111212 is an abundant number, since it is smaller than the sum of its proper divisors (1389308116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131111212 is a wasteful number, since it uses less digits than its factorization.

1131111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78206 (or 78204 counting only the distinct ones).

The product of its digits is 12, while the sum is 14.

The square root of 1131111212 is about 33631.9968482396. The cubic root of 1131111212 is about 1041.9217463027.

Adding to 1131111212 its reverse (2121111311), we get a palindrome (3252222523).

Subtracting 1131111212 from its reverse (2121111311), we obtain a palindrome (990000099).

The spelling of 1131111212 in words is "one billion, one hundred thirty-one million, one hundred eleven thousand, two hundred twelve".